The Collaborative International Dictionary of English v.0.48:

Delilah \De*li"lah\, n.
   The mistress of Samson, who betrayed him (--Judges xvi.);
   hence, a harlot; a temptress.
   [1913 Webster]

         Other Delilahs on a smaller scale Burns met with during
         his Dumfries sojourn.                    --J. C.
                                                  Shairp.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Delilah
    n 1: (Old Testament) the Philistine mistress of Samson who
         betrayed him by cutting off his hair and so deprived him of
         his strength
    2: a woman who is considered to be dangerously seductive [syn:
       enchantress, temptress, siren, Delilah, femme
       fatale]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "Delilah":
   Aspasia, Jezebel, Messalina, Phryne, Thais, adventuress, courtesan,
   demimondaine, demimonde, demirep, femme fatale, harem girl,
   hetaera, houri, odalisque, seductress, temptress, vamp, vampire



Easton's 1897 Bible Dictionary:

Delilah
   languishing, a Philistine woman who dwelt in the valley of Sorek
   (Judg. 16:4-20). She was bribed by the "lords of the
   Philistines" to obtain from Samson the secret of his strength
   and the means of overcoming it (Judg. 16:4-18). She tried on
   three occasions to obtain from him this secret in vain. On the
   fourth occasion she wrung it from him. She made him sleep upon
   her knees, and then called the man who was waiting to help her;
   who "cut off the seven locks of his head," and so his "strength
   went from him." (See SAMSON.)


Hitchcock's Bible Names Dictionary (late 1800's):

Delilah, poor; small; head of hair